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Pension and Other Postretirement Benefit Plans - Net Pension Cost for Schlumberger Pension Plans and US Postretirement Medical Plan (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Postretirement medical plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 8 | $ 7 | $ 24 | $ 22
Interest cost | 11 | 12 | 33 | 35
Expected return on plan assets | (15) | (16) | (47) | (46)
Amortization of prior service cost | (7) | (7) | (21) | (22)
Total pension cost | (3) | (4) | (11) | (11)
US |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 14 | 14 | 44 | 44
Interest cost | 41 | 44 | 125 | 131
Expected return on plan assets | (61) | (60) | (186) | (181)
Amortization of prior service cost | 3 | 3 | 9 | 9
Amortization of net loss | 12 | 10 | 36 | 29
Total pension cost | 9 | 11 | 28 | 32
International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 35 | 24 | 105 | 71
Interest cost | 77 | 76 | 229 | 230
Expected return on plan assets | (149) | (135) | (442) | (406)
Amortization of prior service cost | 3 | 24 | 8 | 73
Amortization of net loss | 35 | 30 | 105 | 90
Total pension cost | $ 1 | $ 19 | $ 5 | $ 58

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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